HCS08 datasheet(309/374 Pages) NXP

309 / 374 page

Universal Serial Bus Device Controller (S08USBV1)

MC9S08JM60 Series Data Sheet, Rev. 5

Freescale Semiconductor

309

17.4

Functional Description

This section describes the functional behavior of the USB module. It documents data packet processing

for endpoint 0 and data endpoints, USB suspend and resume states, SOF token processing, reset conditions

and interrupts.

17.4.1

Block Descriptions

Figure 17-2 is the block diagram. The module’s sub-blocks and external signals are described in the

following sections. The module involves several major blocks — USB transceiver (XCVR), USB serial

interface engine (SIE), a 3.3 V regulator (VREG), endpoint buffer manager, shared RAM arbitration, USB

RAM and the SkyBlue gasket.

17.4.1.1

USB Serial Interface Engine (SIE)

The SIE is composed of two major functions: TX Logic and RX Logic. These major functions are

described below in more detail. The TX and RX logic are connected by a USB protocol engine which

manages packet flow to and from the USB module. The SIE is connected to the rest of the system via

EPSTALL

Endpoint Stall — When set, this bit indicates that the endpoint is stalled. This bit has priority over all other

control bits in the endpoint control register, but is only valid if EPTXEN=1 or EPRXEN=1. Any access to this

endpoint will cause the USB module to return a STALL handshake. Once an endpoint is stalled it requires

intervention from the host controller.

0 Endpoint n is not stalled

1 Endpoint n is stalled

EPHSHK

Endpoint Handshake — This bit determines if the endpoint will perform handshaking during a transaction

to the endpoint. This bit will generally be set unless the endpoint is isochronous.

0 No handshaking performed during a transaction to this endpoint (usually for isochronous endpoints)

1 Handshaking performed during a transaction to this endpoint

Table 17-19. Endpoint Enable/Direction Control

Bit Name

Endpoint Enable/Direction Control

EPCTLDIS

EPRXEN

EPTXEN

Disable endpoint

Enable endpoint for IN(TX) transfers only

Enable endpoint for OUT(RX) transfers only

Enable endpoint for IN, OUT and SETUP transfers.

RESERVED

Table 17-18. EPCTLn Field Descriptions (continued)

Field

Description

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